Add browserslist-lint results

[sashachabin]

Changes

• Added lint: [ { type, message }, ... ] field to HTTP API response
  UPD: it seems the server code is not updated in the preview
• Added output in the client. Create warning, similar errors
• Fixed Node.js examples lint error (Add ignoring Node.js in countryWasIgnored rule lint#1)
• Updated README.md

Questions

• How to display multiple warnings? (design) Now I output with . <br />
  
• Should we do something for warning's a11y?
• Should we automatically update browserslist-lint every day (as browserslist and caniuse-lite)?
• Our first example with defaults and supports es6-module contains coverage errors :(

Closes #390

[sashachabin]

Package size limit has exceeded by 286 B

I can combine renderWarning and renderError functions

[sashachabin]

Now we can use this design.
But alerts will have problems with layout shift :(

[ai]

How to display multiple warnings? (design) Now I output with .

It is better to add new design.

Should we do something for warning's a11y?

We will do it as a part of #442

Should we automatically update browserslist-lint every day (as browserslist and caniuse-lite)?

Good idea. Done a0db083

Our first example with defaults and supports es6-module contains coverage errors :(

Yes, we will think about it in next major update of Browserslist

[ai]

Note that right now there is an error on result rendering

TypeError: o is undefined

[sashachabin]

Note that right now there is an error on result rendering

Yes. I haven't figured out what the problem is yet.

I wrote about it above.
Locally there is a lint field in HTTP API response, but it is not in the preview.

[ai]

Why is not updated? We deploy client and server together

[sashachabin]

Why is not updated? We deploy client and server together

Fixed! You can watch the preview :)

I forgot about npm link when I edited browserslist-lint yesterday. Everything is fine with the deployment)

[ai]

We need to remove "" from warnings or replace it to ("" was used to highlight important parts of the warning)

[ai]

I moved full design to another task #457

[sashachabin]

Replaced quotes with <strong>...</strong>. Looks good